Paranormal Activity 4 uncovers what's really bugging that demon

Paranormal Activity is the franchise that keeps on giving. The last film was its biggest yet, earning $205 million worldwide. So it's no surprise it's back for round four. Despite the threat of overkill, directors Ariel Schulman and Henry Joost promise there's more story to be told.

In the latest issue of Entertainment Weekly, Schulman and Joost explain that Paranormal Activity 4 serves a purpose. In the grand scheme of things, it actually advances the series.

"I can tell you this - we're definitely expanding on the mythology and the history of this demon," says Schulman. "We're really trying to get to the bottom of it!"

They also gave an update on what's really going on with Katie (Katie Featherston). The duo claims she'll be back in some form or fashion, as "she haunts our dreams." It's a cryptic response, but would you expect anything different?

The latest installment in the long-running found footage-style horror series Paranormal Activity opens October 19, and to prove the hat trick hasn't gotten old, the studio has released a new trailer showing audience-goers freak the flip out while watching part four. So what's all the fuss about?

Paranormal Activity, which started as a found footage indie film in the vein of The Blair Witch Project, has quickly grown into one of the biggest modern horror franchises of the decade. Luckily, there's a nifty new infographic to help keep all those sequels straight.